When a JavaScript URL (javascript:) is evaluated and the result is a string, this string is parsed to create an HTML document, which is then presented. Previously, this document's URL (as reported by the document.location property, for example) was the originating javascript: URL which could lead to spoofing attacks; it is now correctly the URL of the originating document. This vulnerability affects Firefox < 74.
Cuando una JavaScript URL (javascript:) es evaluada y el resultado es una cadena, esta cadena es analizada para crear un documento HTML, que luego es presentado. Anteriormente, la URL de este documento (según lo reportado por la propiedad document.location, por ejemplo) era el URL javascript: de origen que podría conllevar a ataques de suplantación de identidad; ahora es correctamente la URL del documento de origen. Esta vulnerabilidad afecta a Firefox versiones anteriores a 74.
Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, spoof the URL or other browser chrome, obtain sensitive information, bypass Content Security Policy protections, or execute arbitrary code. Various other issues were also addressed.
